During the Early Part of the Cleavage Stage in Frog

Question

During the early part of the cleavage stage in frog development,the rapidly developing cells
A)skip the mitosis phase of the cell cycle.
B)skip the S phase of the cell cycle.
C)skip the G₁ and G₂ phases of the cell cycle.
D)rapidly increase the volume and mass of the embryo.
E)skip the cytokinesis phase of the cell cycle.

Accepted Answer

During the early part of the cleavage stage, the rapidly developing cells in frog development undergo very brief or absent G₁ and G₂ phases of the cell cycle, allowing rapid cell division without a corresponding increase in cell size. The S phase (DNA synthesis phase) and cytokinesis phase of the cell cycle still occur during the cleavage stage. The increase in the number of cells leads to an increase in the volume and mass of the embryo.